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diff --git a/3 resources/nix/Flake.md b/3 resources/nix/Flake.md new file mode 100644 index 0000000..754556f --- /dev/null +++ b/3 resources/nix/Flake.md @@ -0,0 +1,22 @@ +#nix #flake + +--- +Nix flakes are source trees containing a file `flake.nix` at their root. The file `flake.nix` provides a standardized way to provide [[Zettelkast/Index/Nix]] artifacts. It's like a package manager for [[Zettelkast/Index/Nix]]. A flake can be dependent on other Flakes and it's possible to pin dependencies to exact revisions by using a `flake.lock` file. + +Nix flake evaluation is hermetic, meaning that it produces the same result wherever it's built.k + +The feature can be enabled in `~/.config/nix/nix.conf`: + +``` +experimental-features = nix-command flakes +``` + +To initialize in a repo: `nix flake init`. + +In flakes dependencies have to be specified explicitly and MUST be locked to specific versions therefore it's no longer allowed to use the nixpkgs found in `NIX_PATH` by referencing it like `<nixpkgs>`. + +Output of a Flake is an arbitrary [[Zettelkast/Index/Nix]] value such as a package, [[NixOS]] module or library function. +Commands `nix build` and `nix shell` will build the output `packages.<system>.default` unless we specify another output, for example: `nix shell .#checks.aarch64-linux.build`. + +--- +[Flakes Wiki](https://nixos.wiki/wiki/Flakes)
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